Device for holding piston pins tight



C. Y. KNIGHT DEVICE FOR HOLDING PISTON PINS`TIGHT Original Filed Feb. 5, 1923 f f f /r ATTORNEY Patented Feb. 21, 11928.

Latem kGHARI-LES .Y- KNIG-ll., 0F PAADElTA, CALIFORNIA, .ASSIGNOR 'l'O KNIGHT & KIL- BOURNE DEVELOPMENT C0 QF CCAGOfILLNQISLA QOBPORATiZO-N 0F ILLINOIS.

" .DEVICE ror'norrilve Bisi-10N `rms Mailr- Application led February 5r, I1923, Serial No. 616,927. lB enewe1d July 1g, `1h92?.

This invention relates to a device for hold-V ing a piston pin tight duri-ng all v.operations ltothereby eliminate any Vpossible noise which might occur yfrom .a slight wear.

jIt is an object of the invention therefore to provide means for exerting pressure between the gudgeon pin in a pis-ton assembly and the bearing trunnions in the piston. i

A further object ofthe present invention relates -to a method of constructionand assembly of a piston provided with means for yexerting pressure and predetermining the Apressure between the wrist vor gudgeon pin and Ythe bearings thereof in thepist'on.

A -further object of the present invention Yrelatestoa device of the character described which may beadjusted after use Ato compensate or :take up for any lpossible wear which may occur. -V

A further object of the present invention relates to means for locking -the pressure applying mea-ns 'between the trunnionfbearings and the wrist pin so that a continuousprevdetermined pressure may be maintained :throughout an extended period inruse.

vVarious other objects are within the scope of `this invention such as 'relate to the arrangement .of the related elements of `the structure; .to various details ofconstruction; -to economies of manufacture; and :to Aeach ofthe other features of novelty' as will lappear from aconsiderationpf thedetailsof the drawing and relateddescription cfa Lcertain form ofthe invention which 4may Bhe preferred in Ywhich drawings: y

lFigure '-1 Vis .a vertical sectional .view through the piston assembly.

Figure 2 is a transverse sectional :view taken at right anglesto lFigure 1. l

Figi1res'3,14,f5 and 6 are sectional views through the bearing .between the piston trunnions and the .gudgeon :pin illustrating .the method of construction and assembly in .pro- .viding the .pressure andfwear compensating device.

'Referring to Figure `1,.in which the piston 10- is illustrated as provided with the usual piston rings 12 and the piston rod 14 is connected thereto through the gudgeon pin 16 made in tubular form for lightness,l being supported in the trunnions 18 and 2O as shown.

The bearings 18 and 2O are each provided with longitudinal slots or cutaway portions 22 shown in the present instance to extend pointed set screw rare then reamed to sizey and from the inside surface 2 4 of the bearing outwardly about half the depth of the bearing, the bottom surface of kthe :kerf or l.slot being inclined as yshown at' 26. This cutaway portion will permit lthe `inner edges of the trunnions to be nspread land the resiliency of the material will tendto return this portion of the bearing to'nnormafl positionand v1t is upon this action :that I depend for se- Curing my yPiston pin holding means and wear 'compensating'device Suitable :means for `spreeding 4the inner portion of the trunnions consists in providing the trunnion with a conical seat 28, with a screw-threaded opening 30 entering same from the interior ofthe bearing, .the conical seat terminating in the 'base `26 of the slot 2e. (See iFigures 11, e, Sand 6). A 32 is screw-,threaded frills shown into the openingSO, in vthe bearing, and lhas a conical end ,34 adapted to Lcoact with the conicaly surface 128 as will `hert-iinafter appear, -toadjust the spreadof the inner portion ofthe bearing. A screw-threaded lock nut I36 holds the set-screw 82 in any position of adjustment as will be linderstood by fthose skilled in the art.

`The method vforming apart ofthe present invention whereby Ithe partsareassenib'led -to provide a suitable device forthe purposes intended .and the .convenient method .o'f insuring proper lit and operationof the part-s of the piston and piston rod assembly ,consist-sinrst providing the trunnions 18 and 20 shown in Figure 3 with the transverse ylrerf 22-as shown in Figure 4 and :boring Ithe same 'to size. The bearings are then provided or mayhavelbeen theretofore provided with the conical seat A28 and y'threaded opening 30. The-set screw 30 isthen inserted the full amount and the bearing :is spread -to a certain ,extent without excessive straining the material ofthe bearings. The trunnions the set screw backed Yslightly offy 'to permit the walls to spring or `clos'eback still Vfurther to a sulficient amount to properly hug the piston ory gudgeon pin 1G after the same has been inserted therein as shown in Figure 6. The lock nut 36 is then screwed tight against the flat bottom surface 38 of the bearing. When the piston is irst assembled on the piston rod the conical end 34of the set-screw 32 still eX- erts considerable pressure so that the huggingv action of the end of the bearing may be later increased by further backing-olf the spreading pressure of the set-screw 30 to take up for any Wear after the piston has been used. l

It is apparent that Within the spirit of the invention modications and different arrangements may be made other than as herein disclosed, and the present disclosure is illustrative merely, the invention comprehending all'variations illustrated.

Having thus described my invention, what I desire to secure by United States Letters Patent and claim is:

' gudgeon l. In a device of the class described including a piston, a piston rod, a gudgeon pin for connecting the piston rod to the piston, adjustable bearings in the piston to rotatably support said gudgeon pin, said bearings having a normal diameter' less than that of the pin, and means associated With said bearings for adjusting the diameter of the bearing to that of the pin.

2. In a. piston and piston rod assembly, a piston, a piston rod, a Wrist pin secured to said rod,'trunnions in said piston for movably supporting said Wrist pin, a slot in said trunnions and means to spread said trunnions and release said spread in order to permit said trunnions to eXert a pressure around said Wrist pin. v

3. rIhe method of assembling a piston and piston rod connection of the character described Which consists in: boring the trunnions of the piston Which support the pin forming a radial slot in the inner Wall of the trunnion, yinserting a spreading means in said slot, reaming said trunnions to size, assembling said piston, piston rod and gudgeon pin in said trun- Vnionsand releasing` said spreading means to the. desired amount.

4. In a piston and piston rod assembly having a piston rod gudgeon pin andpiston t-runnions, means inherent in said trunnions for applying pressure to the piston gudgeon pin; means for relieving or increasing the trunnion pressure on the pin; and means to lock said pressure applying means in a predetermined position.

5. In a piston and piston Vrod assembly, single adjustable means to apply release pressure to the piston gudgeon pin by the trunnions and means to lock said last mentioned means in a predetermined position.

6. In a cooperating bearing assembly, the combination of a socket member .having a bearing surface having a normal predetermined curvature; and a coacting bearing element adapted to engage said surface; and means including a pin movable in and hav ing Wedging engagement With the Walls of a slot formed in said bearing surface but not extendingl through said socket member adapted to vary the curvature of the surface to correspond to that of the element.

7. That'method of assemblying cooperatin drilling the socket to form a bearing having a diameter less than the approximate side of the pin; slotting ay portion of said bearing; inserting a spreading means in said ing pin and socket members Which consistsL slot to diminish the curvature of the bearing; reaming the socket to the size of the pin; assembling the pin in said socket; and releasing the spreading means of the socket u ntil the curvature thereof corresponds to that of the pin. y Y v 8. In a piston and piston rod assembly, the combination of a piston;` a piston rod; a Wrist pin secured to said rod; ytrunnionsin said piston for movably supporting said Wrist pin; and means for exertingu'niform pressure by the trunnions on said pin, lsaid means comprising Wedging mechanism adapted to have movement in a slot formed Ain the Wall of the trunnions to varyrthehsiae thereof in accordance with tho size ofthe pin; and means 'for varying the position of said Wedge., L

v9. In cooperatingv bearing assembly, the

combination of a socket member having a slot extending part Way into the inner Wall thereof; a Wedge member positioned in said socket slot and adapted to have movement therein to vary the curvature ofthe socket Wall; a pi-n adapted tohave cooperative en`l gagement With said socket, the normal curvature of the pin being greater than that of the socket, and the curvature of the socket beingadjustable to tit that of the pin.

10. In a cooperating bearing assembly, a

bearingelement; a socket member for rotatably supporting said element having slot in the bearing surface thereof; and means to distort said socket member about -thebaseof said slot, said means acting in the plane Vof said slot, whereby the bearing surface of said socket member may be adjusted to conform to said bearing element.

In testimony whereof, I ailix my signature.

CHARLES Y. KNIGHT.V 

